Originally Posted by doitmyself
Originally Posted by WhizkidTN
Sorry, but Hyundai released a PDF concerning the SP4-M when they released it a few years back and THEY say it replaces the older fluids (SP-III, etc.).
Hyundai introduced SP4-M in June 2013 with no mention of it being backwards compatible:
http://www.hyundaiflashdrive.com/ho...-iv-discontinued-introducing-new-at.html
In this 2015 TSB, they state that SP4-M in not interchangeable with SP-III:
https://testing-public.carmd.com/Tsb/Download/106597/5002779 ...
"SP4-M supersedes SPH-IV. SP-III, SP4-M and SPH-IV-RR are not interchangeable."
What TSB shows that the SP4-M supercedes SP-III?
This is what I was referring to:
http://static1.1.sqspcdn.com/static...7260727/SP4-M+Promo-Sell+Sheet-FINAL.pdf
And upon further inspection, I think I was wrong.
I don't see where it specifically states that it can and should be used for applications that previously has been using SP-III. I guess why I thought this was when I was planning on changing mine last year, the Kia dealership parts department stated that it was to be used in all the past and current 6-speed automatics. They didn't have any of the SP-III bottles on their stock shelf. I ended up using the Amsoil OE Fuel-Efficient Synthetic fluid instead due to some recommendations that it was a better ATF over even the new OEM SP4-M fluid.
Hmm...
Why that is confusing is that according to the second link you referenced (i.e., the TSB), if you scroll down to the YF Sonata's (which my '12 Kia Optima is a mechanical twin of), it DOES list the SP4-M as the recommended ATF while the bottom of that same page says they are not interchangeable.